A365640 Prime powers of the form 2^k + 1.

2, 3, 5, 9, 17, 257, 65537

Offset: 1

Author

Juri-Stepan Gerasimov, Nov 10 2023

Keywords

• nonn

Comments

By Mihăilescu's theorem, this is just the union of {2, 9} and the Fermat primes A019434. - Robert Israel, Nov 10 2023

Crossrefs

Subsequence of A000961. Supersequence of A019434 and A092506.

Programs

Magma

[2^k+1: k in [0..1000] | IsPrimePower(2^k+1)];